FBA SHIPMENT LOST IN AMAZON WAREHOUSE -AMAZON COMPLETE STONWALL !! Never want to send FBA again

Hi all

Sent 2 boxes to Amazon that were Delivered on the 30th October last year .

I have been given the run around ever since I have been asked for proof of ownership and proof of delivery , both have been given

i have then been told that not eligible for investigation , because this can only be done when all units are checked in and received.

I am then told that i have to wait 45 days for it to be closed . but it is now 7o and it is still not closed .

i escalate to the manging director , who says they can only get involved once a case has been opened . I point out there there are 2 cases opened already which have been merged , when no will ever read the case history and just ignore everything .

I then get a message from leadership and management team to provide proof of delivery , which i do again

I then get a message to state that they will not reimburse because i used DPD A NON PARTNERED COURIER and I should have used UPS

Any advice on what to do because i am really fed to the back teeth with being asked to do one thing and then that doing it and that being completely ignored